东南极拉斯曼丘陵中山站地区Rb含量初步调查

PRELIMINARY SURVEY FOR RB CONTENT AROUND ZHONGSHAN STATION IN THE LARSEMANN HILLS OF EAST ANTARCTICA

利用手持快速矿石分析仪(NITON XL3t-500S GOLDD)对拉斯曼丘陵中山站附近出露的基岩进行测试,初步调查结果显示该地区有明显的Rb元素富集。测试了17个样品,其中12个的Rb含量达到了0.04%,1个样品的Rb含量达到0.1%以上。分析测试样品特征,并结合拉斯曼丘陵地质特征发现,拉斯曼丘陵地区Rb的富集与含黑云母的泛非期伟晶岩墙关系密切,而且粒度越大Rb含量越高,类比推测该区域Rb元素富集潜力巨大,有必要继续开展相应的地质调查工作,进一步探讨其富集成因和规律。

NITON XL3t-500S GOLDD was applied to test bedrock samples outcropping near Zhongshan Station in the Larsemann Hills of Antarctica. Preliminary survey results show apparently enriched rubidium（Rb） contents. Among the 17 tested rock samples, 12 contained around 0.04% Rb, and one contained as much as 0.1%. By analyzing the sample features, and considering the geological characteristics of the Larsemann Hills, we conclude that the enrichment of Rb is related strongly to a biotite-pegmatite dyke formed in the Pan-African period. Furthermore, the larger the grains in the sample, the greater the Rb content. By ana-logical analysis, we speculate that the Larsemann Hills have big Rb potential. Therefore, it is necessary to carry out the corresponding geological investigation to further our understanding of the causes for and rules governing Rb enrichment in the Larsemann Hills.